The type of fan or blower with a blade design that is ...

[cherise1989]

The type of fan or blower with a blade design that is self-cleaning and a good choice for air containing a lot
  of dust or grease is the _____.
 
  a. forward-curved centrifugal
  b. radial
  c. backward-inclined centrifugal
  d. ducted fan

Question 2

The smoke damper that provides the minimum amount of leakage is rated _____.
 
  a. Class 1
  b. Class 2
  c. Class 3
  d. Class 4

[tuate]

Answer to Question 1

b

Answer to Question 2

a

[cherise1989]

Thanks for the timely response, appreciate it

[triiciiaa]

Gracias!